AP2210N-2.8TRG1 Просмотр технического описания (PDF) - BCD Semiconductor

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AP2210N-2.8TRG1

300mA RF ULDO REGULATOR

BCD Semiconductor 

300mA RF ULDO REGULATOR

Application Information

Input Capacitor

A 1µF minimum capacitor is recommended to be

placed between VIN and GND.

Output Capacitor

It is required to prevent oscillation. 1.0µF minimum

is recommended when CBYP is unused. 2.2µF mini-

mum is recommended when CBYP is 100pF. The out-

put capacitor may be increased to improve transient

response.

Noise Bypass Capacitor

Bypass capacitor is connected to the internal voltage

reference. A small capacitor connected from BYP to

GND make this reference quiet, resulting in a

significant reduction in output noise, but the ESR

stable area will be narrowed. In order to keep the

output stability, it is recommended to use the bypass

capacitor no more than 100pF.

The start-up speed of the AP2210 is inversely

proportional to the value of reference bypass

capacitor. In some cases, if output noise is not a

major concern and rapid turn-on is necessary, omit

CBYP and leave BYP open.

Power Dissipation

Thermal shutdown may take place if exceeding the

maximum power dissipation in application. Under all

possible operating conditions, the junction tempera-

Data Sheet

AP2210

ture must be within the range specified under abso-

lute maximum ratings to avoid thermal shutdown.

To determine if the power dissipated in the regulator

reaches the maximum power dissipation (see figure

16, 17), using:

TJ = PD*θJA + TA

PD=(VIN-VOUT)*IOUT+VIN*IGND

Where: TJ≤TJ(max), TJ(max) is absolute maximum rat-

ings for the junction temperature; VIN*IGND can be

ignored due to its small value.

TJ(max) is 150oC, θJA is 200oC/W, no heatsink is

required since the package alone will dissipate

enough heat to satisfy these requirements unless the

calculated value for power dissipation exceeds the

limit.

Example (3.0V version):

IOUT=300mA, TA=50oC, VIN(Max) is:

(150oC-50oC)/(0.3A*200oC/W)+3.0V=4.67V

Therefore, for good performance, please make sure

that input voltage is less than 4.67V without heatsink

when TA=50oC.

Jul. 2011 Rev. 1. 5

BCD Semiconductor Manufacturing Limited

18

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